SNVS680I August   2010  – April 2018 LM25119

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Typical Application Circuit
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Switching Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  High Voltage Start-Up Regulator
      2. 7.3.2  UVLO
      3. 7.3.3  Enable 2
      4. 7.3.4  Oscillator and Sync Capability
      5. 7.3.5  Error Amplifiers and PWM Comparators
      6. 7.3.6  Ramp Generator
      7. 7.3.7  Current Limit
      8. 7.3.8  Hiccup Mode Current Limiting
      9. 7.3.9  Soft Start
      10. 7.3.10 HO and LO Output Drivers
      11. 7.3.11 Maximum Duty Cycle
      12. 7.3.12 Thermal Protection
    4. 7.4 Device Functional Modes
      1. 7.4.1 Diode Emulation
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Miscellaneous Functions
      2. 8.1.2 Interleaved Two-Phase Operation
      3. 8.1.3 Interleaved 4-Phase Operation
    2. 8.2 Typical Applications
      1. 8.2.1 Dual-output Design Example
        1. 8.2.1.1 Design Requirements
          1. 8.2.1.1.1 External Components
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1  Timing Resistor
          2. 8.2.1.2.2  Output Inductor
          3. 8.2.1.2.3  Current Sense Resistor
          4. 8.2.1.2.4  Ramp Resistor and Ramp Capacitor
          5. 8.2.1.2.5  Output Capacitors
          6. 8.2.1.2.6  Input Capacitors
          7. 8.2.1.2.7  VCC Capacitor
          8. 8.2.1.2.8  Bootstrap Capacitor
          9. 8.2.1.2.9  Soft Start Capacitor
          10. 8.2.1.2.10 Restart Capacitor
          11. 8.2.1.2.11 Output Voltage Divider
          12. 8.2.1.2.12 UVLO Divider
          13. 8.2.1.2.13 MOSFET Selection
          14. 8.2.1.2.14 MOSFET Snubber
          15. 8.2.1.2.15 Error Amplifier Compensation
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Two-Phase Design Example
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Switching Jitter Root Causes and Solutions
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Community Resources
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6.5 Electrical Characteristics

Typical values correspond to TJ = 25°C. Minimum and maximum limits apply over –40°C to 125°C junction temperature range. VIN = 36 V, VCC = 8 V, VCCDIS = 0 V, EN2 = 5 V, RT = 25 kΩ, and no load on LO or HO (unless otherwise noted).
PARAMETER TEST CONDITIONS MIN(1) TYP MAX(1) UNIT
VIN SUPPLY
IBIAS VIN operating current VSS1 = VSS2 = 0 V 6 7.3 mA
VVCCDIS = 2 V, VSS1 = VSS2 = 0 V 340 500 µA
IVCC VCC1 operating current VVCCDIS = 2 V, VSS1 = VSS2 = 0 V 3.9 4.5 mA
VCC2 operating current VVCCDIS = 2 V, VSS1 = VSS2 = 0 V 1.4 2 mA
ISHUTDOWN VIN shutdown current VUVLO = 0 V, VSS1 = VSS2 = 0 V 15 33 µA
VCC REGULATOR(2)
VCC(REG) VCC regulation 6.77 7.6 8.34 V
VIN = 4.5 V, No external load 4.4 4.46
Sourcing current limit VCC = 0 V 25 40 mA
VCCDIS switch threshold VVCCDIS rising 1.19 1.25 1.29 V
VCCDIS switch hysteresis 0.07 V
VCCDIS input current VVCCDIS = 0 V –20 nA
Undervoltage threshold Positive going VCC 3.8 4 4.2 V
Undervoltage hysteresis 0.2 V
EN2 INPUT
VIL EN2 input low threshold 2 1.5 V
VIH EN2 input high threshold 2.9 2.5 V
EN2 input pullup resistor 50 kΩ
UVLO
Threshold UVLO rising 1.2 1.25 1.29 V
Hysterisis current VUVLO = 1.4 V 15 20 25 µA
Shutdown threshold 0.4 V
Shutdown hysteresis voltage 0.1 V
SOFT START
Current source VSS = 0 V 7 10 13 µA
Pulldown RDSON 10 Ω
ERROR AMPLIFIER
VREF FB reference voltage Measured at FB pin, FB = COMP 0.788 0.8 0.812 V
FB input bias current VFB = 0.8 V 1 nA
FB disable threshold Interleaved threshold 2.5 V
COMP VOH ISOURCE = 3 mA 2.8 V
COMP VOL ISINK = 3 mA 0.31 V
AOL DC gain 80 dB
fBW Unity gain bandwidth 3 MHz
PWM COMPARATORS
tHO(OFF) Forced HO OFF-time 220 320 430 ns
tON(min) Minimum HO ON-time CRAMP = 50 pF 100 ns
OSCILLATOR
fSW1 Frequency 1 RT = 25 kΩ 180 200 220 kHz
fSW2 Frequency 2 RT = 10 kΩ 430 480 530 kHz
RT output voltage 1.25 V
RT sync positive threshold TJ = 25°C 2.5 3.2 4 V
Sync pulse minimum width 100 ns
CURRENT LIMIT
VCS(TH) Cycle-by-cycle sense voltage
threshold (CS – CSG)		 RAMP = 0 106 120 134 mV
CS bias current VCS = 0 V –70 –95 µA
Hiccup mode fault timer 256 Cycles
RES
IRES Current source 9.7 µA
VRES Threshold CRES charging 1.2 1.25 1.3 V
DIODE EMULATION
VIL DEMB input low threshold 2 1.65 V
VIH DEMB input high threshold 2.9 2.6 V
DEMB input pulldown resistance 50 kΩ
SW zero cross threshold –5 mV
LO GATE DRIVER
VOLL LO low-state output voltage ILO = 100 mA 0.1 0.18 V
VOHL LO high-state output voltage ILO = –100 mA, VOHL = VCC – VLO 0.17 0.26 V
LO rise time CLOAD = 1000 pF 6 ns
LO fall time CLOAD = 1000 pF 5 ns
IOHL Peak LO source current VLO = 0 V 2.5 A
IOLL Peak LO sink current VLO = VCC 3.3 A
HO GATE DRIVER
VOLH HO low-state output voltage IHO = 100 mA 0.11 0.19 V
VOHH HO high-state output voltage IHO = –100 mA, VOHH = VHB – VHO 0.18 0.27 V
HO rise time CLOAD = 1000 pF 6 ns
HO fall time CLOAD = 1000 pF 5 ns
IOHH Peak HO Source current VHO = 0 V, VSW = 0, VHB = 8 V 2.2 A
IOLH Peak HO sink current VHO = VHB = 8 V 3.3 A
HB to SW undervoltage 3 V
HB DC bias current VHB – VSW = 8 V 70 100 µA
THERMAL
TSD Thermal shutdown Rising 165 °C
Thermal shutdown hysteresis 25 °C
(1) Minimum and maximum limits are 100% production tested at 25°C. Limits over the operating temperature range are specified through correlation using Statistical Quality Control (SQC) methods. Limits are used to calculate Texas Instrument's Average Outgoing Quality Level (AOQL).
(2) Per VCC Regulator.